TWI604783B - Seedling transplant machine - Google Patents

Description

Seedling transplanter

The present invention relates to a seedling transplanting machine equipped with a soil preparation device for soil preparation of a butt.

The grading device of Patent Document 1 includes a rotator group that transmits power from a rear axle box via a universal joint and a connecting shaft to an interlocking and connected grounding drive shaft, and transmits power from the grounding drive shaft to the transmission case. It is driven by rotation by a rotating fulcrum protruding from the gearbox. Further, the bowl-shaped lid body is housed and attached to the concave space portion of the rotating body located at the end portion of the rotating body group, thereby reducing the adhesion of the inclusions to the rotating body and also functioning as a scraper.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Patent No. 4960123

According to the technique described in Patent Document 1, it is possible to reduce the inclusion of inclusions such as straw in the rotating body by the bowl-shaped lid. However, since the portion of the rotating support shaft protruding from the transmission case has a gap into which the inclusion can enter, there is a possibility that the seal member of the transmission case is damaged due to the inclusion of the inclusion attached to the rotary support shaft.

The seedling transplanting machine of the present invention includes a grading device that is driven to receive power from an engine, and the grading device includes a transmission case that transmits power from the engine, and a drive shaft that is disposed from the hub via an oil seal Projecting toward the side, the hub is disposed to protrude from both sides of the transmission case toward the side; a plurality of grounding rotors are fixed to the drive shaft, and are disposed from the outer end of the hub toward the inner side of the case a protective member for covering an outer end portion of the hub of the foregoing transmission case.

The protective member is rotatably fixed to the transmission case, and a sliding portion for pulverizing inclusions is formed between the protective member and the drive shaft.

The protective member protrudes from the outer end portion of the hub portion of the transmission case toward the inner side of the case.

The drive shaft system includes: a rotor input shaft protruding from a hub portion of the transmission case toward a side; and a rotor drive shaft connected to the rotor input shaft via a joint, the end portion of the joint input shaft side of the joint facing the aforementioned transmission The hub of the box is extended and the extended end of the joint is configured It is closer to the inside of the box than the hub of the aforementioned transmission case.

Further, the support arm includes a support arm that rotatably supports the drive shaft, and the support arm includes a bearing housing for accommodating a bearing provided between the drive shaft and the support arm, and is configured to be housed in the bearing The oil seal on both sides of the oil seal seals the plate body to the rotor drive shaft on the outer side of the oil seal in the bearing housing, and the side end of the bearing shell protrudes outward from the plate body.

According to the present invention, the periphery of the hub as the power take-out portion from the transmission case toward the drive shaft is covered by the protective member, and the process from the opening of the protective member to the oil seal provided at the hub of the transmission case can be made into a labyrinth structure. , can inhibit the inclusions from reaching the oil seal.

1‧‧‧ rice transplanter (plant transplanter)

20‧‧‧The ground preparation device

22‧‧‧ Gearbox

23‧‧‧Drive shaft

24‧‧‧ground rotor

25‧‧‧Rotor input shaft

26‧‧‧Rotor drive shaft

27‧‧‧Connectors

42‧‧‧ Hub

43‧‧‧ bearing

44‧‧‧ oil seal

50‧‧‧protective components

60‧‧‧ bearing shell

64‧‧‧ board

Figure 1 is a side view of a rice transplanter.

Figure 2 is a skeleton diagram showing the transmission mechanism of the rice transplanter.

Figure 3 is a diagram showing the construction of the grading device.

Figure 4 is an enlarged cross-sectional view showing the transmission portion of the grading device.

Fig. 5 is an enlarged cross-sectional view showing the effect of the protective member.

Fig. 6 is a view showing a support structure of a protective member.

Fig. 7 is an enlarged cross-sectional view showing the bearing structure of the support arm of the grading device.

Figure 8 is a diagram of the marker of the rice transplanter.

Figure 9 is an enlarged cross-sectional view showing another embodiment of the transmission portion of the grading device.

Figure 10 is a cross-sectional view of the transmission case.

Fig. 11 is an enlarged cross-sectional view showing the effect achieved by the enlarged diameter portion of the joint.

Figure 12 is an enlarged cross-sectional view showing another embodiment of the labyrinth structure of the transmission case and the joint.

Figure 13 is a view showing another embodiment of a protective structure provided to the opening of the transmission case.

Figure 14 is an enlarged cross-sectional view showing the bearing structure of the support arm of the grading device.

Fig. 15 is an enlarged cross-sectional view showing the effect achieved by the bearing housing by the protective member.

A rice transplanter 1 as an embodiment of the seedling transplanter of the present invention will be described with reference to the attached drawings.

As shown in Fig. 1, the rice transplanter 1 includes an engine 2, a power transmission unit 3, a planting unit 4, and a lifting unit 5. The planting unit 4 is connected to the living body via the lifting unit 5, and can be moved up and down in the vertical direction by the lifting unit 5. The power from the engine 2 is transmitted to the planting unit 4 via the power transmission unit 3 . The rice transplanter 1 is planted in the open field by the planting unit 4 while walking by the engine 2.

The driving force from the engine 2 is transmitted to the PTO shaft 7 via the transmission 6 in the power transmission unit 3 . The PTO shaft 7 is provided to protrude rearward from the transmission case 6. The power is transmitted from the PTO shaft 7 to the planting transmission case 8 via the universal joint to drive the planting portion 4. Further, the drive shaft 9 is disposed rearward from the transmission case 6 for transmitting the driving force from the drive shaft 9 to the rear axle housing 10.

A plurality of floats 11 are disposed in front of the planting position of the planting portion 4. The planting unit 4 is provided with a leveling device 20 in front of the float 11.

As shown in FIG. 2, the powertrain is transmitted from the engine 2 to the transmission 6. The inside of the transmission case 6 is provided with a hydraulic-mechanical continuously variable transmission (HMT) 12, a main shifting mechanism 13, a main clutch 14 for switching the power transmission from the HMT 12 to the main shifting mechanism 13, and a main shifting gear for the main shifting The brake device 15 that brakes the rotation of the output shaft of the mechanism 13.

The power from the engine 2 transmits power to the left and right front axles 16 and 16 via the HMT 12 and the main shifting mechanism 13 in the transmission 6 to drive the left and right front wheels 17 and 17.

Further, power is transmitted from the output shaft of the main shifting mechanism 13 to the rear axle housing 10 via the drive shaft 9. The ground drive shaft 18 extends rearward from the rear axle housing 10, and power is transmitted to the grounding drive shaft 19 that is coupled to and coupled thereto via the ground drive shaft 18 and the universal joint. The grading device 20 is then driven by the grading drive shaft 19.

As shown in Fig. 3, the leveling device 20 is attached to the planting frame 4a for supporting the planting portion 4 via the support link mechanism 30. The support link mechanism 30 supports the grading device 20 so as to be able to support the planting portion 4 Lift (turn). That is, the leveling device 20 can change the height with respect to the planting portion 4 in accordance with the elevation of the support link mechanism 30.

The support link mechanism 30 is provided with a link support shaft 31 which is provided along the extending direction of the leveling device 20 (width direction of the planting frame 4a), and a link 32 fixed to both ends of the link support shaft 31; An arm 33 for connecting the link 32 and the grading device 20 and supporting the grading device 20; and an auxiliary link 34 for connecting the lower end of the support arm 33 with the planting frame 4a.

The link support shaft 31 is rotatably supported by the planting frame 4a at both end portions thereof via the arm portion 35. As described above, in the support link mechanism 30, the link 32 is rotated by the rotation of the link support shaft 31, and the support arm 33 is moved up and down, whereby the ground preparation device 20 can be changed with respect to the planting frame 4a (planting) The height of the part 4).

As shown in FIGS. 3 and 4, in the grading device 20, a part of the power from the drive shaft 9 is branched through the rear axle housing 10 at the grounding drive shaft 19, and is coupled to and coupled to the grounding drive shaft 19. The input shaft 21, and the transmission case 22 for receiving the input of the input shaft 21, are transmitted to the drive shaft 23 that projects toward both sides of the transmission case 22. A plurality of grading rotors 24 are fixed to the drive shaft 23. The drive shaft 23 is formed to have a quadrangular cross-sectional view, and is engaged with the quadrangular opening of the center of the ground rotor 24 to fix the ground rotor 24 so as not to relatively rotate the drive shaft 23.

The drive shaft 23 is constituted by a rotor input shaft 25 projecting from both sides of the transmission case 22 toward the side, and a rotor input shaft A rotor drive shaft 26 that extends and extends toward both sides, and a joint 27 for connecting the rotor input shaft 25 to the rotor drive shaft 26. The connection of the rotor input shaft 25 and the rotor drive shaft 26 to the joint 27 is achieved by spline fitting.

As shown in FIG. 4, in the inside of the transmission case 22, the helical gear is fixed to the end of the input shaft that is coupled to and coupled to the grounding drive shaft 19, and the helical gear 41 that meshes with the helical gear is fixed to the rotor input shaft 25. Midway department. Power is transmitted from the ground drive shaft 19 to the rotor input shaft 25 via the input shaft via the helical gear described above.

The rotor input shaft 25 is provided to protrude from the hub portion 42 toward the side, and the boss portion 42 protrudes from both side faces of the transmission case 22 toward the side. The inner peripheral surface of the hub portion 42 is sequentially disposed: a bearing 43 for supporting the rotor input shaft 25 to be freely rotatable, and an oil seal 44 for ensuring the sealability in the transmission case 22.

As shown in Fig. 4, a protective member 50 is provided between the transmission case 22 and the ground preparation rotor 24 disposed adjacent to both sides of the transmission case 22.

The protective member 50 is for covering the outer end of the hub portion 42 and is disposed to protrude from the outer end portion of the hub portion 42 toward the inner side of the transmission case 22. In other words, the inner end portion of the protective member 50 is extended to overlap the protruding end portion of the boss portion 42, so that the path reaching the oil seal 44 disposed in the boss portion 42 is formed in a labyrinth shape.

As shown in Fig. 5, the inclusions such as straw that are wound up by the rotation of the ground preparation rotor 24 and invade between the transmission case 22 and the ground preparation rotor 24 will It stays in the vicinity of the ground preparation rotor 24, and then advances from the ground preparation rotor 24 side toward the transmission case 22 side.

Therefore, the path from the inner end portion of the protective member 50 to the inside and then toward the boss portion 42 is formed to be opposite to the traveling direction of the inclusions (the direction from the outer side toward the inner side of the transmission case 22). Then, the intrusion direction from the outer end portion of the hub portion 42 toward the oil seal 44 is formed in the opposite direction. As described above, by providing the protective member 50 as a labyrinth structure, the path of the oil seal 44 reaching the transmission case 22 and the traveling direction of the inclusion are formed in opposite directions.

As described above, by providing the protective member 50 for covering so as to overlap the boss portion 42 of the transmission case 22, it is possible to effectively prevent the inclusions from entering the oil seal 44 of the transmission case 22.

As shown in Figs. 4 and 5, a flange 27a for positioning the center of rotation of the grading rotor 24 is formed at the end of the joint 27 on the side of the rotor input shaft 25, and is formed to be further oriented from the flange 27a. An extended end portion 27b projecting from the side of the hub portion 42. The projecting end portion 27b extends beyond the outer end portion of the hub portion 42.

As described above, the projecting end portion 27b as the inner end of the joint 27 is disposed more inward than the outer end portion of the hub portion 42 of the transmission case 22, and a labyrinth structure is formed in the process of reaching the oil seal 44. Thereby, the inclusions are prevented from reaching the oil seal 44 of the transmission case 22.

As shown in Fig. 6, the protective member 50 is fixed to the transmission case 22 by bolts so as not to be rotatable. More specifically, the transmission case 22 has a configuration in which the upper and lower sides are divided into two parts, and the upper side is shared The lower member is fastened with a bolt to fix the protective member 50.

That is, the drive shaft 23 is formed to be rotatable to the protective member 50 that is fixed so as not to be rotatable. Thereby, even when the inclusions intrude into the internal space of the protective member 50, the sliding portion 51 is formed between the protective member 50 and the drive shaft 23, and the inclusions can be pulverized by the sliding portion 51. Therefore, even if the inclusions intrude into the inside of the protective member 50, they are pulverized by the scraper effect of the sliding portion 51 to prevent it from being wound around the drive shaft 23.

Further, as shown in Fig. 6, a baffle 52 is attached to the lower surface of the protective member 50. The baffle 52 is provided to protrude downward from the lower surface of the protective member 50 and is provided in substantially the entire area of the lower half of the protective member 50. By the baffle 52 on the lower surface side of the protective member 50, the progress of the inclusions from the side of the ground preparation rotor 24 can be physically blocked. Thereby, the amount of inclusions reaching the oil seal 44 can be reduced.

As shown in Fig. 7, a bearing housing 60 formed in a cylindrical shape is provided at a support portion of the drive shaft 23 of the support arm 35.

The bearing housing 60 houses a bearing 61 for supporting the drive shaft 23 so as to be rotatable, and an oil seal 62 disposed at both side portions of the bearing 61. In the bearing housing 60, there is an opening corresponding to the cross-sectional shape of the drive shaft 23, and a collar 63 having a circular outer peripheral surface is fixed to the drive shaft 23, and a bearing 61 is fixed to the outer peripheral surface of the collar 63. Oil seal 62.

A plate body 64 is provided at both end portions of the collar 63. The plate body 64 is fixed to the drive shaft 23 and has a circular outer peripheral surface. The outer peripheral surface of the plate body 64 reaches the vicinity of the inner peripheral surface of the bearing housing 60. The outer end of the bearing housing 60 is extended to the outside of the outer end of the collar 63, and further Step out to the outside of the plate 64.

As described above, the side end of the bearing case 60 formed in a cylindrical shape protrudes more laterally than the collar 63 as the support portion, and the plate body 64 is disposed on the end surface of the collar 63. The plate body 64 physically prevents the inclusions from reaching the oil seal 62 housed in the bearing housing 60.

Further, by fixing the plate body 64 to the drive shaft 23 (the rotor drive shaft 26), the plate body 64 can be rotated with respect to the bearing housing 60. Thereby, the inclusions that have entered between the plate body 64 and the inner circumferential surface of the bearing shell 60 can be pulverized finely. Further, by making the shape of the outer peripheral surface of the plate body 64 into a shape suitable for pulverizing inclusions, the effect of the scraper can be enhanced.

Further, it is preferable that the inner space surrounded by the oil seal 62 in the bearing housing 60 is filled with fat. As described above, even when the lip of the oil seal 62 is damaged by the filling and fatliquoring, it is expected that the grease can be prevented from intruding into the inside.

A donut-shaped stopper ring 65 is provided on the outer side of the oil seal 62. A snap ring 65 is fixed to the inner peripheral surface of the bearing housing 60 for positioning the oil seal 62. The outer peripheral surface of the plate body 64 is preferably set to be larger than the diameter of the snap ring 65 formed in a donut shape.

As shown in Fig. 8, the marker 70 that performs the lifting operation in synchronization with the planting operation has a structure in which the intermediate portion is divided and the front end portion can be changed from the intermediate portion. Specifically, the joint 71 is disposed at the intermediate portion of the marker 70 and is configured to be rotatable closer to the distal end side than the joint 71. When the joint 71 is pulled up by the marker 70, the joint 71 is disposed such that when the front end portion is rotated from the joint 71 toward the inside of the body, the joint 71 does not The position of the rice transplanter 1 in which the body is horizontally wide (outer body contour) protrudes. In particular, when the number of the eight plantings is increased, the width of the planting portion 4 is also increased. Considering the above-mentioned situation, the space in which the rice transplanter 1 is loaded on the truck for transportation and the rice transplanting are considered. When the machine 1 is in the space for storage, it is necessary to suppress the full width, so that the marker 70 is not formed to be the outermost outer contour of the rice transplanter 1.

For example, by the configuration in which the joint 71 has a stopper function, the switching of the front end position of the marker 70 by the joint 71 at the time of non-working is only in the storage position and the pull-up position. The angle is switched between the positions, whereby it can be reliably stored inside the outer contour of the rice transplanter 1.

In the construction of the prior art, a part of the marker is removed, or the elasticity of the marker is used to lock the hook portion fixed to the body to accommodate the marker, so that the marker does not face the outside of the body Highlight a lot.

Here, in the marker 70 which is divided by the joint 71, when the marker 70 is accommodated by rotating the joint 71 as a fulcrum, it is not necessary to protrude to the outside of the body or to remove the front end from the joint 71. It will become unnecessary after storage. Further, the wiper 70 can be housed in a self-standing state in accordance with the stopper function of the joint 71. Further, in this case as well, the wiper 70 can be locked with the hook portion or the like.

[Other embodiments]

Next, other embodiments of the transmission portion of the grading device and other embodiments of the bearing housing will be described with reference to Figs. 9 to 15 .

As shown in Fig. 9, in the inside of the transmission case 22, the helical gear 28 is disposed at the end of the input shaft 21 that is interlocked with and coupled to the grounding drive shaft 19, and the helical gear 29 that meshes with the helical gear 28 is fixed at The middle portion of the rotor input shaft 25. Power is transmitted to the rotor input shaft 25 via the helical gears 28, 29 described above. Rotation of the rotor input shaft 25 drives the rotor drive shaft 26 via the joint 27 to rotate the ground rotor 24 .

As shown in FIGS. 9 and 10, the transmission case 22 is constituted by the body 80 and the cover 82. The main body 80 has an opening through which the input shaft 21 is inserted, and the input shaft 21 is rotatably supported by the inner circumference of the opening, and has openings 81 through which the drive shaft 23 (the rotor input shaft 25) penetrates. The cover 82 is used to support the drive shaft 23 (the rotor input shaft 25) to be freely rotatable and to block the opening 81 of the body 80.

The main body 80 is formed as an integrally formed box-shaped member and has an opening through which the input shaft 21 is inserted and an opening 81 through which the drive shaft 23 is inserted, and the inside thereof is configured as a cylindrical member and is formed to have: The accommodating portion 80a that accommodates the helical gears 28 and 29 and the opening through which the input shaft 21 is inserted are provided, and a cylindrical portion 80b that protrudes forward from the accommodating portion 80a toward the front (the rear axle housing 10 side) is provided. The main body 80 is integrally formed and includes a housing portion 80a and a cylindrical portion 80b.

The inner peripheral surface of the cylindrical portion 80b is sequentially disposed from the opening side to seal the oil seal 90 in the transmission case 22 and the bearings 91 and 91 for supporting the input shaft 21 to be rotatable.

The cover 82 is disposed on both sides of the body 80 The opening 81 is blocked to seal the internal space of the body 80. An O-ring 92 is disposed between the outer side surface of the cover 82 and the inner side surface of the body 80. The center portion of the lid body 82 is provided with a penetrating portion through which the rotor input shaft 25 is inserted, and is integrally formed with a hub portion 83 that protrudes from both side faces of the lid body 82 toward the side edges along the penetrating portion. The inner peripheral surface of the hub portion 83 is sequentially disposed from the opening side: an oil seal 93 for sealing the inside of the transmission case 22, and a bearing 94 for supporting the rotor input shaft 25 to be freely rotatable, and is provided with The stop ring 95 of the oil seal 93 is fixed.

The transmission case 22 is constructed by the body 80 and the cover 82 for blocking the opening 81 of the body 80, so that the integrally formed body 80 can obtain greater rigidity. As described above, by forming the main body 80 into a structure having no joint body, the torque in the case where the torque is fluctuated by the input shaft 21 supported by the main body 80 via the bearing 91 is not applied to the main body 80, and The deformation of the body 80 is prevented. That is, it is possible to minimize the influence of the movement caused by the input shaft 21 due to the torque fluctuation due to the rotational motion or the imbalance of the shaft or the like provided on the transmission path as much as possible. Therefore, it is possible to prevent the airtightness of the transmission case 22 from being impaired due to the deformation of the body 80.

In addition, by integrally forming the body 80, it is not necessary to assemble the body 80 when assembling the transmission case 22, and since the combined position of the inside of the body 80 is determined at the time of molding, the internal parts of the body 80 can be improved. The accuracy of positioning of the various components when assembling the gearbox 22 is combined.

Furthermore, by making the cover 82 a high rigidity without seams The hub portion 83 is formed integrally with the cover body 82, and the hub portion 83 holds the bearing 94 for supporting the drive shaft 23 (the rotor input shaft 25) and protrudes toward the side of the body 80 even if When the rotor input shaft 25 generates a torque fluctuation, it can be absorbed by the entire transmission case 22 including the lid body 82 having high rigidity and the body 80 to which the lid body 82 is fixed. Thereby, the influence of the swimming movement caused by the rotor input shaft 25 on the cover 82 can be minimized as much as possible. Therefore, the sealing property of the lid body 82 can be ensured and the bearing 94 can be prevented from being damaged.

As shown in Fig. 9, the end portion of the joint 27 on the side of the transmission case 22 is for covering the outer end portion of the hub portion 83, and is disposed to protrude from the outer end portion of the hub portion 83 toward the inner side of the transmission case 22. In other words, the inner end portion of the joint 27 is provided with an enlarged diameter portion 27a which is larger than the outer diameter of the rotor input shaft 25, and the outer peripheral portion of the enlarged diameter portion 27a is further extended to protrude from the hub portion 83. The departments overlap.

As described above, by arranging the open portion of the enlarged diameter portion 27a of the joint 27 so as to cover the boss portion 83 of the transmission case 22, the path to the oil seal 93 is formed into a labyrinth shape.

Further, the transmission case 22 is filled with lubricating oil. Thereby, it is possible to confirm whether or not the lubricating oil leaks from the inside and the outside of the transmission case 22, and it is possible to confirm the breakage of the lip portions of the oil seals 90 and 93 of the transmission case 22. The damage of the oil seals 90 and 93 is dealt with by early detection, and damage of the bearing rings 91 and 94 and the helical gears 28 and 29 disposed on the inner side can be prevented.

As shown in Fig. 10, the upper surface of the body 80 of the transmission case 22 is formed with an oil hole 85, and a nozzle head for blocking the oil hole 85 is installed. (nipple)86. Further, the transmission case 22 is filled with lubricating oil. Thereby, it is possible to confirm whether or not the lubricating oil leaks from the inside and the outside of the transmission case 22, and it is possible to confirm the breakage of the lip portions of the oil seals 90 and 93 of the transmission case 22. The damage of the oil seals 90 and 93 is dealt with by early detection, and damage of the bearing rings 91 and 94 and the helical gears 28 and 29 disposed on the inner side can be prevented.

Further, a drain pipe (not shown) for taking out the lubricating oil inside is provided at the lower rear portion of the main body 80, and the internal lubricating oil can be easily discharged and exchanged.

Furthermore, the gearbox 22 can also be filled with grease to replace the lubricating oil.

As shown in Fig. 10, the protective member 87 is fixed to the outer circumference of the cylindrical portion 40a of the main body portion 40. The protective member 87 is a member for protecting the periphery of the joint portion between the input shaft 21 and the grounding drive shaft 19, and is used for covering and protecting the grounding drive shaft 19 coupled to the input shaft 21, and a universal joint disposed between each other. .

The protective member 87 is a bellows-shaped protective cover, and is fixed to the periphery of the cylindrical portion 80b that protrudes toward the front of the body 80 using a jig 88. Since the cylindrical portion 80b protrudes forward from the front surface of the housing portion 80a formed in a box shape, the length of the cylindrical portion 80b can be directly used as a fixing portion of the jig 88, and the fixed length of the protective member 87 can be fixed. Made longer. Thereby, the protective member 87 can be attached more firmly, and it can prevent that it falls off, or a gap arises. Therefore, there is no possibility that the mud or the inclusions intrude into the inside of the transmission case 22 from the side of the protective member 87, and it is possible to prevent the adverse factor caused by the above-mentioned intrusion.

As shown in Fig. 11, the rotation of the ground rotor 24 is rolled up The inclusions such as straw that have entered between the transmission case 22 and the ground preparation rotor 24 are retained in the vicinity of the ground preparation rotor 24, and then proceed from the ground preparation rotor 24 side toward the transmission case 22 side.

Therefore, the path from the open portion of the inner end portion of the joint 27 to the inside and then toward the opening of the hub portion 83 is formed in the opposite direction to the direction in which the inclusions proceed (the direction from the outer side of the transmission case 22 toward the inner side). Then, the intrusion direction from the outer end portion of the hub portion 83 toward the oil seal 93 is formed in the opposite direction. As described above, by providing the joint 27 as a labyrinth structure, the path of the oil seal 93 reaching the transmission case 22 is opposite to the traveling direction of the inclusions.

As described above, by using a part of the joint 27 for connecting the rotor input shaft 25 and the rotor drive shaft 26 as the enlarged diameter portion 27a, and providing the enlarged diameter portion 27a to cover the boss portion 83 of the transmission case 22, it is effective. The inclusions are prevented from invading the oil seal 93 of the transmission case 22.

Further, since the enlarged diameter portion 27a of the joint 27 physically blocks the passage of the inclusions, the amount of inclusions reaching the inner end portion of the joint 27 can be reduced. Further, the inclusions advance along the outer circumference of the joint 27 which is disposed as a rotating body, and when the inclusions exceed the enlarged diameter portion 27a, the centrifugal force of the rotation acts in a direction in which the inclusions are separated from the joint 27, and thus it is expected The effect of effectively absorbing the inclusions from the joint 27.

As shown in Fig. 11, the transmission case 22 is fixed to the drive shaft 23 so as not to be rotatable. That is, the drive shaft 23 is formed to rotate relative to the hub portion 83 of the transmission case 22 that is fixed to be non-rotatable. Thereby, a sliding portion 96 is formed between the inner circumferential surface of the joint 27 and the outer circumferential surface of the boss portion 83.

Further, even when the inclusions intrude into the gap between the joint 27 and the boss portion 83, the inclusions can be pulverized by the sliding portion 96. Therefore, even if the inclusions intrude into the inside of the joint 27, they are pulverized by the scraper effect of the sliding portion 96, and it is prevented from reaching the oil seal 93 and can be prevented from being wound around the drive shaft 23.

Fig. 12 is a view showing another embodiment of the labyrinth structure of the transmission case 22 and the joint 27.

As shown in Fig. 12, by providing the enlarged diameter protrusion 100 at the inner end portion of the enlarged diameter portion 27a of the joint 27, it is possible to serve as a physical obstacle for the inclusions not to reach the open portion of the joint 27. Play the function. Further, by providing the groove portion 101 on the outer circumferential surface of the boss portion 83 of the sliding portion 96, it is possible to temporarily store the fine inclusions which are pulverized by the sliding portion 96.

As described above, by making the labyrinth structure between the transmission case 22 and the joint 27 more complicated, the amount of inclusions reaching the oil seal 93 can be further reduced.

Fig. 13 is a view showing another embodiment of the protective structure of the opening provided in the transmission case 22 (the hub portion 83).

As shown in Fig. 13, the joint 27 is not provided with the enlarged diameter portion 27a, but is provided with a projecting portion 102 that projects the open end portion of the hub portion 83 toward the radially outer side, and is provided on the outer circumference of the rotor input shaft 25. Sheet 103. The plate member 103 is a disk-shaped member fixed to the outer circumference of the rotor input shaft 25, and is disposed to face the projecting portion 102 of the boss portion 83. As described above, the inclusions traveling from the side of the ground preparation rotor 24 are blocked by the sheet 103, and The path between the plate member 103 and the projecting portion 102 is set to face in the radial direction, whereby the amount of inclusions reaching the opening of the boss portion 83 can be reduced. Further, the plate member 103 is rotated together with the rotation of the rotor input shaft 25, whereby the extension portion 102 of the boss portion 83 can be relatively rotated. That is, inclusions that invade between the plate member 103 and the projecting portion 102 of the hub portion 83 can be ground.

As shown in Fig. 14, the support portion of the drive shaft 23 of the support arm 33 is provided with a bearing case 60 formed in a cylindrical shape.

The bearing housing 60 houses a bearing 61 for supporting the drive shaft 23 so as to be rotatable, and an oil seal 62 disposed at both side portions of the bearing 61. In the bearing housing 60, there is an opening corresponding to the cross-sectional shape of the drive shaft 23, and a collar 63 having a circular outer peripheral surface is fixed to the drive shaft 23, and a bearing 61 is fixed to the outer peripheral surface of the collar 63. Oil seal 62.

A disk-shaped protective member 66 formed in a plate shape is provided at both end portions of the collar 63. The protective member 66 is disposed to abut against the outer end of the collar 63. The protection member 66 is fixed to the drive shaft 23 and configured to be rotatable together with the rotation of the drive shaft 23.

Both end ends of the bearing housing 60 project beyond the both side ends of the collar 63. The protective member 66 projects from the outer end of the collar 63 to the outer side than the outer end of the bearing housing 60, and projects further outward in the radial direction than the bearing housing 60 and further protrudes toward the inner side of the bearing housing 60. In other words, the protective member 66 includes a central portion 66a that is disposed to be recessed toward the inner side of the bearing housing 60 along the axial direction of the drive shaft 23, and an outer peripheral portion 66b that protrudes outward from the central portion 66a of the recess and that is axially outward and Forming a bend The curved shape is a crank shape to cover the outer end of the bearing housing 60.

As described above, the protective member 66 is provided at each of the openings of the both ends of the bearing housing 60, and the path to the oil seal 62 is formed into a labyrinth shape.

As shown in Fig. 15, the inclusions such as straw that are wound up by the rotation of the grounding rotor 24 and intruded between the bearing shell 60 and the ground preparation rotor 24 are retained in the vicinity of the ground preparation rotor 24, and then from the ground preparation rotor 24 side toward the bearing. The shell 60 side advances.

Therefore, the path from the open portion of the inner end portion of the protective member 66 to the inside and toward the opening of the bearing shell 60 is formed in the opposite direction to the traveling direction of the inclusion (the direction from the outer side of the bearing shell 60 toward the inner side). Then, the intrusion direction from the outer end portion of the bearing housing 60 toward the oil seal 62 is again formed in the opposite direction. As described above, the protective member 66 is provided to form a labyrinth structure such that the path of the oil seal 62 reaching the bearing housing 60 is opposite to the traveling direction of the inclusions.

Further, the inclusions advance from the ground rotor 24 toward the central portion 66a of the protective member 66 along the drive shaft 23, and when the outer peripheral portion 66b is further moved from the central portion 66a, it is necessary to pass over the concave portion of the central portion 66a. That is, the resistance of the inclusions can be imparted by the protective member 66 having a concave shape at the center.

As described above, by providing the protective member 66 to cover the openings at both ends of the bearing housing 60 from the outside, it is possible to effectively prevent the inclusions from entering the oil seal 62 of the bearing housing 60.

And, by fixing the protective member 66 to the drive shaft 23 (rotor drive) The shaft 26) is capable of rotating the protective member 66 with respect to the bearing housing 60. Thereby, the inclusions which invade from the open portion of the protective member 66 to the inner peripheral surface of the protective member 66 and the outer peripheral surface of the bearing shell 60 can be pulverized finely.

The upper surface of the bearing housing 60 is provided with a grease hole 67 and a grease fitting head 68 for blocking the grease hole 67. Further, in the bearing housing 60, the grease is filled in the internal space surrounded by the oil seal 62. As described above, even when the lip of the oil seal 62 is damaged by the filling and fatliquoring, it is expected that the grease can be prevented from intruding into the inside.

A donut-shaped stopper ring 65 is provided on the outer side of the oil seal 62. A snap ring 65 is fixed to the inner peripheral surface of the bearing housing 60 for positioning the oil seal 62. An additional labyrinth structure can be provided in the bearing housing 60 by the snap ring 65.

[Industrial availability]

The present invention is a seedling transplanting machine which can be used for a leveling device having a land preparation for a butt.

22‧‧‧ Gearbox

23‧‧‧Drive shaft

24‧‧‧ground rotor

25‧‧‧Rotor input shaft

26‧‧‧Rotor drive shaft

27‧‧‧Connectors

41‧‧‧ helical gear

42‧‧‧ Hub

43‧‧‧ bearing

44‧‧‧ oil seal

50‧‧‧protective components

51‧‧‧Sliding section

52‧‧‧Baffle

Claims (5)

A seedling transplanting machine comprising: a grading device that is driven to receive power from an engine, wherein the grading device includes a transmission case that transmits power from the engine; and a drive shaft that is disposed from the hub The oil seal protrudes toward the side, the hub is disposed to protrude from both sides of the transmission case toward the side; a plurality of ground preparation rotors are fixed to the drive shaft, and are disposed at an outer end portion of the hub for covering the transmission case The protective member includes: a rotor input shaft protruding from a hub portion of the transmission case toward a side; and a rotor drive shaft connected to the rotor input shaft via a joint to input a rotor input shaft end of the joint The portion projects toward the hub of the transmission case, and the projecting end of the joint is disposed closer to the inside of the case than the hub of the transmission case. The seedling transplanting machine according to the first aspect of the invention, wherein the protective member protrudes from an outer end portion of the hub portion of the transmission case toward an inner side of the case. A seedling transplanting machine comprising: a grading device that is driven to receive power from an engine, wherein the grading device includes a transmission case that transmits power from the engine; and a drive shaft that is disposed from the hub The oil seal protrudes toward the side, the hub protrudes from both sides of the transmission case toward the side; a plurality of ground preparation rotors are fixed to the drive shaft, Further, a protection member for covering an outer end portion of the hub of the transmission case is provided, and further includes: a support arm that rotatably supports the drive shaft, and the support arm includes a bearing housing for housing a bearing between the drive shaft and the support arm, and for receiving an oil seal disposed at two sides of the bearing, fixing a plate body to the rotor drive shaft on an outer side of the oil seal in the bearing shell, and the bearing The side end of the case protrudes outward from the front plate body. The seedling transplanting machine according to claim 3, wherein the protective member protrudes from an outer end portion of the hub portion of the transmission case toward an inner side of the case. The seedling transplanting machine according to the first or second aspect of the invention, further comprising: a support arm that rotatably supports the drive shaft, wherein the support arm includes a bearing housing for housing a bearing between the drive shaft and the support arm, and for receiving an oil seal disposed at two sides of the bearing, fixing a plate body to the rotor drive shaft on an outer side of the oil seal in the bearing shell, and the bearing The side end of the case protrudes outward from the front plate body.